Image() constructor?

[Brian Genisio]

Hey all,

I am trying to figure out what the constructors for the Image object are.

I have figured out that in IE and Mozilla, the Image object, and the
HTMLImageElemen t are the same, from a property perspective at least, but
what is the constructor for the Image object?

I know that I can call the following constructors, but are there others?

Image()
Image(int x, int y)

I could not find any actual spec for this.

Brian

[Brian Genisio]

Re: Image() constructor?

Brian Genisio wrote:
[color=blue]
> Hey all,
>
> I am trying to figure out what the constructors for the Image object are.
>
> I have figured out that in IE and Mozilla, the Image object, and the
> HTMLImageElemen t are the same, from a property perspective at least, but
> what is the constructor for the Image object?
>
> I know that I can call the following constructors, but are there others?
>
> Image()
> Image(int x, int y)
>
> I could not find any actual spec for this.
>
> Brian
>[/color]


Well, I found this...

http://www.powermct.co.kr/teched/ecma/image.html

It says that the constructor is :

Image([width,] [height]);

But, this is a page claiming to be an ECMAScript reference, though the
ECMAScript spec does not talk about images... it is browser thing... so
I do not trust this reference.

Any other ideas?
Brian

[Martin Honnen]

Re: Image() constructor?



Brian Genisio wrote:

[color=blue]
> I am trying to figure out what the constructors for the Image object are.[/color]

Well, if you write Image() (as you do in the subject) then you are
probably talking about a constructor function itself, that available in
client side JavaScript for the purpose of image preloading since Netscape 3:

http://devedge.netscape.com/library/manuals/2000/javascript/1.3/reference/image.html

In general, for host objects, don't expect constructor functions to be
exposed at all or the same in all browsers.

And nowadays, with DOM supporting browser, if you want to create an
<img> element object use document.create Element('img') as
document.create Element is a factory function to create any element from
its tagname.

--

Martin Honnen

http://JavaScript.FAQTs.com/

[Brian Genisio]

Re: Image() constructor?

Martin Honnen wrote:
[color=blue]
>
>
> Brian Genisio wrote:
>
>[color=green]
>> I am trying to figure out what the constructors for the Image object are.[/color]
>
>
> Well, if you write Image() (as you do in the subject) then you are
> probably talking about a constructor function itself, that available in
> client side JavaScript for the purpose of image preloading since
> Netscape 3:
>
> http://devedge.netscape.com/library/...nce/image.html
>[/color]


Yeah, that is what I am looking for. I am implementing a DOM, so I
need to make sure the Image() constructor is avaialable to the user, and
I wanted to make sure I was not missing any constructor capabilities.
[color=blue]
>
> In general, for host objects, don't expect constructor functions to be
> exposed at all or the same in all browsers.
>[/color]

In that case, I will assume the ([width,] [height]) constructor... that
should be safe. Any other constructor the user would use, I would not
need to support.
[color=blue]
> And nowadays, with DOM supporting browser, if you want to create an
> <img> element object use document.create Element('img') as
> document.create Element is a factory function to create any element from
> its tagname.
>[/color]

My DOM supports document.create Element('img') already, so I am cool there.

Thanks,
Brian